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Question

The longest cell in the plant kingdom is

A
Sieve tube
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B
Vessel
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C
Sclerenchyma fibre
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D
Tracheid
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Solution

The correct option is C Sclerenchyma fibre
Sclerenchyma is a simple permanent tissue composed of dead cells and whose cell walls are thickened by lignin deposits. They provide mechanical support to the plant.
There are 2 types of sclerenchyma cells - scleroids and fibres.
Fibres are elongated and pointed cells which are the longest cells in the plant kingdom. They are of great economical value due to their use in the textile industry.
Hence the correct option is C.

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